妊娠定性试验的尿标本最好是()
A.首次晨尿
B.随时尿标本
C.下午的尿标本
D.夜间尿标本
E.午间中段尿
参考答案:A
He may not even drink water at night, _______ swallowing insects possibly floating on the surface.
A.in case of
B.for fear of
C.for the sake of
D.in line with
电视信号通过电磁波传输,其传输速度与真空中光速相同,为 m/s。